It’s also not clear exactly what components Apple will be making at this facility. MacRumors believes that Apple will make something called “sapphire glass” there, which is an extremely scratch-resistant type of glass. Apple uses it to protect its iPhone cameras and for the Touch ID home buttons on the iPhone 5s, MacRumors says.

An investment in a facility could mean Apple is expanding its use of sapphire glass, leading some to speculate it may be making a new smartwatch.

One thing is clear. Apple has been making an effort to bring more manufacturing back to the U.S. It is also assembling its MacBook Pro PCs at a Flextronics plant in Austin, Texas.